:root {
  --primary: #0f3d5e;
  --accent: #21a0a0;
  --bg: #fbfcfe;
  --text: #1a2433;
  --muted: #6b7a90;
  --shadow: 0 20px 45px rgba(15, 61, 94, 0.15);
  font-size: 16px;
}
*, *::before, *::after { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
header {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 1px 12px rgba(15, 61, 94, 0.08);
  backdrop-filter: blur(6px);
}
.container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0.5rem;
  position: relative;
  border-bottom: 1px solid rgba(15, 61, 94, 0.08);
}
.nav::after {
  content: "";
  position: absolute;
  inset: auto 0 -1.2rem 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(15, 61, 94, 0), rgba(33, 160, 160, 0.25), rgba(15, 61, 94, 0));
}
.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: 0.02em;
  position: relative;
  padding-left: 2.4rem;
}
.logo::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1.65rem;
  height: 1.65rem;
  border-radius: 12px;
  background: linear-gradient(135deg, #21a0a0, #0f3d5e);
  box-shadow: 0 10px 18px rgba(15, 61, 94, 0.25);
}
.logo::after {
  content: "";
  position: absolute;
  left: 0.58rem;
  top: calc(50% - 0.36rem);
  width: 0.48rem;
  height: 0.72rem;
  border-radius: 6px;
  background: #fff;
  opacity: 0.85;
}
nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: inline-flex;
  gap: 1.4rem;
  align-items: center;
}
nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
  padding: 0.4rem 0;
}
nav a:hover,
nav a:focus {
  color: var(--primary);
}
nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(33, 160, 160, 0.1), rgba(33, 160, 160, 0.6), rgba(15, 61, 94, 0.7));
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.25s ease;
  opacity: 0.95;
}
nav a:hover::after,
nav a:focus::after {
  transform: scaleX(1);
}
.icon {
  width: 1.1rem;
  height: 1.1rem;
  fill: currentColor;
  flex-shrink: 0;
}
.btn .icon {
  color: inherit;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--muted);
  margin: 0.35rem 0;
  font-size: 0.98rem;
}
.contact-item a {
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
}
.contact-item a:hover {
  text-decoration: underline;
}
main {
  position: relative;
}
main::before,
main::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background: radial-gradient(circle at top right, rgba(33, 160, 160, 0.14), transparent 55%),
              radial-gradient(circle at 10% 35%, rgba(15, 61, 94, 0.12), transparent 50%);
}
main::after {
  filter: blur(80px);
  opacity: 0.7;
}
.hero {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  align-items: center;
  padding: 5.5rem 0 4.5rem;
  position: relative;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -4rem 40% auto -12rem;
  height: 320px;
  background: linear-gradient(135deg, rgba(33, 160, 160, 0.2), rgba(15, 61, 94, 0));
  filter: blur(30px);
  z-index: -1;
}
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.2rem);
  line-height: 1.15;
  margin-bottom: 1.5rem;
  color: var(--primary);
}
.hero p {
  font-size: 1.05rem;
  margin-bottom: 2rem;
  color: var(--muted);
}
.actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.btn {
  padding: 0.85rem 1.8rem;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}
.btn.primary {
  background: linear-gradient(135deg, #21a0a0, #0f3d5e);
  color: #fff;
  box-shadow: var(--shadow);
}
.btn.primary:hover {
  transform: translateY(-2px);
}
.btn.secondary {
  border: 1px solid rgba(15, 61, 94, 0.2);
  color: var(--primary);
  background: #fff;
  position: relative;
}
.btn.secondary::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(33, 160, 160, 0.16), rgba(15, 61, 94, 0.05));
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: -1;
}
.btn.secondary:hover::after {
  opacity: 1;
}
.hero-card {
  background: #fff;
  border-radius: 24px;
  padding: 2.2rem;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.hero-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(33, 160, 160, 0.12), rgba(15, 61, 94, 0.08));
  z-index: 0;
}
.hero-card ul {
  position: relative;
  z-index: 1;
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1.2rem;
}
.hero-card li {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}
.hero-card strong {
  color: var(--primary);
  display: block;
  font-size: 1rem;
  margin-bottom: 0.4rem;
}
.hero-media {
  position: relative;
  display: grid;
  gap: 1.5rem;
}
.hero-media figure {
  margin: 0;
  border-radius: 26px;
  overflow: hidden;
  box-shadow: 0 25px 40px rgba(15, 61, 94, 0.18);
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.16);
}
.hero-media img {
  width: 100%;
  display: block;
  transition: transform 0.6s ease;
}
.hero-media figure:hover img {
  transform: scale(1.06);
}
.hero-media figcaption {
  position: absolute;
  bottom: 1.2rem;
  left: 1.4rem;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  background: rgba(15, 61, 94, 0.85);
  color: #fff;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  box-shadow: 0 10px 22px rgba(15, 61, 94, 0.35);
}
section {
  padding: 4rem 0;
}
.section-alt {
  background: linear-gradient(135deg, rgba(15, 61, 94, 0.04), rgba(33, 160, 160, 0.04));
}
section h2 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  text-align: center;
  margin-bottom: 3rem;
  color: var(--primary);
}
.grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.card {
  background: #fff;
  border-radius: 20px;
  padding: 1.8rem;
  box-shadow: 0 18px 35px rgba(15, 61, 94, 0.12);
  border: 1px solid rgba(15, 61, 94, 0.05);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 28px 48px rgba(15, 61, 94, 0.18);
}
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(33, 160, 160, 0.08), rgba(15, 61, 94, 0.04));
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: -1;
}
.card:hover::after {
  opacity: 1;
}
figure.card {
  padding: 0;
  display: flex;
  flex-direction: column;
  min-height: 100%;
}
figure.card img {
  width: 100%;
  height: 230px;
  object-fit: cover;
}
figure.card figcaption {
  padding: 1.4rem 1.6rem;
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.6;
}
.card h3 {
  margin-top: 0;
  color: var(--primary);
  font-size: 1.25rem;
}
.card p {
  margin: 0.5rem 0 0;
  color: var(--muted);
}
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}
.stat {
  background: linear-gradient(135deg, rgba(33, 160, 160, 0.12), rgba(15, 61, 94, 0.08));
  border-radius: 18px;
  padding: 1.8rem;
  text-align: center;
  border: 1px solid rgba(15, 61, 94, 0.1);
}
.stat strong {
  display: block;
  font-size: 2.1rem;
  color: var(--primary);
}
.columns {
  display: grid;
  gap: 2.5rem;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}
.columns-stack {
  display: grid;
  gap: 1.5rem;
}
.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1rem;
}
.feature-list li {
  background: #fff;
  border-radius: 14px;
  padding: 1rem 1.2rem;
  box-shadow: 0 16px 30px rgba(15, 61, 94, 0.12);
  border: 1px solid rgba(15, 61, 94, 0.04);
}
.feature-list span {
  display: block;
  font-weight: 600;
  color: var(--primary);
}
.faq-item {
  border-bottom: 1px solid rgba(107, 122, 144, 0.2);
  padding: 1.2rem 0;
}
.faq-item h3 {
  margin: 0 0 0.6rem;
  font-size: 1.1rem;
  color: var(--primary);
}
.faq-item p {
  margin: 0;
  color: var(--muted);
}
footer {
  background: #0b2335;
  color: rgba(255, 255, 255, 0.82);
  padding: 2.5rem 0;
}
footer .footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem;
}
footer a {
  color: rgba(255, 255, 255, 0.82);
  text-decoration: none;
}
footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.75rem;
}
footer .copyright {
  margin-top: 2rem;
  font-size: 0.85rem;
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
}
@media (max-width: 720px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem 0;
  }
  .nav::after {
    inset: auto 0 -0.5rem 0;
  }
  nav ul {
    flex-wrap: wrap;
    gap: 1rem 1.5rem;
  }
  .hero {
    padding-top: 4rem;
  }
  .hero::before {
    inset: -2rem -6rem auto -8rem;
  }
  .hero-media figure {
    border-radius: 22px;
  }
}